Rucksack



FIG. 1 is a front perspective view of a rucksack of the claimed design;

FIG. 2 is a front elevational view of the rucksack shown in FIG. 1;

FIG. 3 is a rear elevational view of the rucksack shown in FIG. 1;

FIG. 4 is a right side elevational view of the rucksack shown in FIG. 1;

FIG. 5 is a left side elevational view of the rucksack shown in FIG. 1;

FIG. 6 is a top plan view of the rucksack shown in FIG. 1; and,

FIG. 7 is a bottom plan view of the rucksack shown in FIG. 1.

CLAIM I claim the ornamental design for a rucksack, as shown anddescribed.